diff --git a/spectrum/src/frontends/slack/SlackIdManager.h b/spectrum/src/frontends/slack/SlackIdManager.h
index edcbfd590601734b2c8b3178612c90dd877bfc39..4d4c58d2cfb31abd262edb34eeb522e2d1db0139 100644
--- a/spectrum/src/frontends/slack/SlackIdManager.h
+++ b/spectrum/src/frontends/slack/SlackIdManager.h
@@ -47,8 +47,6 @@
 #include <algorithm>
 #include <map>
 
-#include <boost/signal.hpp>
-
 namespace Transport {
 
 class SlackIdManager {